Saeko Iwaki
ABSTRACT
IEEE802.11 wireless LAN system has several transmission rates (multi-rate).The appropriate rate should be chosen to obtain maximum Quality of Service (QoS) such as throughput. The throughput is determined by two factors; one is retransmission delay and the other is "carrier busy" waiting time. A previous research reveals that the appropriate rate should be changed in stepwise by the discrete distances between an access point (AP) and terminals with considering only the retransmission. Although it could be useful when no interferences cause carrier busy, the interferences from noise and other systems such as other wireless LANs must be considered in real situations. Therefore, this paper investigates how much the interferences affect the throughput by using real access points and terminals as well as the retransmission. Experimental results in various situations such as in indoors, in outdoors and in radio-shielded boxes are compared to show quantity evaluation of "carrier busy" waiting time. The results indicate that quite large portion of throughput degradation in outdoors is caused by "carrier busy" waiting time. For proposing and evaluating QoS control in wireless LAN, for example, AP assignment control, such large interferences should be taken account of to achieve more precise effects.
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Index Terms
- Throughput analysis and measurement on real terminal in multi-rate wireless LAN
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